• promotion of selective conversion of methanol to xylenes over trimetallic & alkaline-low-si/al zsm-5

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    • تاریخ ارائه: 1395/09/20
    • تاریخ انتشار در تی پی بین: 1395/09/20
    • تعداد بازدید: 372
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    in the current communication, the catalytic conversion of methanol to gasoline range hydrocarbons has been studied over mesoporous low-silica zsm-5 (si/al=11) catalysts while the promotional effect of zn and fe was also explored. the catalyst was prepared by employing alkaline treatment of the parent zsm-5 (alk-zsm-5) prior to impregnation with fe and zn. the catalyst samples were characterized by using xrd, xrf, nh3-tpd, sem, tga, ft-ir techniques. on the basis of tpd analysis, the incorporation of zn into zsm-5 adjusted the acidity to notable strong/weak ratio of 2.1. the parent zsm-5 and [fe, zn]-alk-zsm-5 catalysts were hired for the conversion of methanol to gasoline (mtg) process. the dehydration of methanol over catalysts carried out in a fixed-bed tubular reactor at 375°c and whsv of 1.9 h-1 under ambient pressure. the trimetallic catalyst [fe, zn]-alk-zsm-5 exhibited great improvement in selectivity for aromatic hydrocarbons on the basis of gc and gc-ms results. [fe, zn]-alk-zsm-5 catalyst was capable to promote the formation of 86.8 wt.% aromatics with highly selective for xylenes selectivity (44.7 %) having very low content of benzene (0.1%). both of the catalysts enjoy of long-term activity, e.g. keeping ~96% of their activity after 8 h.

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